This story is written in response to Gidgetgirl's The Spiked Challenge. So bare with me... I only own my original characters.

Another different key setup challenge. When the monks made the key, they divided it into two entities, humans who they inserted into the lives of two champions: a slayer and a vampire. The destiny of the two keys is tied together, and their protectors must bind together if the four of them are to have a hope of saving the world.

Requirements:

- Part of the Key is sent to a slayer (Buffy or Faith) in the form of a sister or brother.

- Part of the Key is sent to a vampire (Spike or Angel) in the form of a younger sister or brother.

- One key must be male, and the other must be female, though they can be children or teens.

- There must be a kind of soul mates connection between the two keys, but they must hate each other out of habit, like siblings growing up.

- There must be a ship corresponding to who the keys belong to: Buffy/Angel, Buffy/Spike, Faith/Angel, or Faith/Spike.

I hope to have this take place during season five when Dawn was first introduced, but I may have to cutout a few episodes and reorder them in my style to make every fit, so here goes. Well I hope you like this little piece of my imagination. Later!
Twin Keys of Light and Darkness

- Written by GoldenEyedVamp

Prologue - A Change for the Better?

"But Buffy, I want to come too"

"No, this is a date and when I go out on a date, you can not come with me"

Dawn Summers stood pouting on the doorstep of her family's house. Her elder sister could always be the worst when it came to treating her like a person. She watched as the slayer slipped out of sight and then followed. It was because of her rebellious streak; she had suck out anyway. She didn't understand why Buffy had such a big problem with her; it was her fault that she went all PMS on her.

She followed at a distance, enough for Buffy not to be able to notice her. She had fond that Buffy wasn't technically on a date, but rather sneaking off herself to go talk with Giles at the Magic Box. They were talking about something and felt so unsettling, that Dawn had finally decided that she would rather head for home.

"Don't you think it's a lil bit late for a girl such as yourself to be out in dark?"

Dawn whipped about to find a boy her age smirking at her. He reminded her of Spike. The boy had high cheekbones, perusing blue eyes, but thick curly mocha colored hair rather the platinum blond. That wasn't to say that he was any better looking then Spike – heck, Spike would always be the mouth-watering goodness, even though he is a vampire.

"Oh, now I've gone and made the bit speechless" he laughed.

British. He even had a British accent like pike too, only his wasn't too cocky sounding.

"And who are you?" she decided to snip back at him.

"I'm the new guy in town. Unfortunately Social Services got a hold of me and shipped me off to my eldest known relative, so here I am stuck in this hellhole"

Dawn couldn't help but snort at the irony of his comment. Vampires and demons and slayers, it didn't get any better then that.

"But who are you?" she stressed and then began to tap her foot with irritation.

"Who me?" he grinned innocently, and just the action of it made her flesh crawl. "James Castles, crumpet"

He turned to leave, satisfied with having pestered this girl enough, but stopped to make a final exit.

"But I would be careful if I were you pet, bad things are known to happen when it gets dark"

He turned on his heal and left Dawn standing confused. If he had been a vampire, he would have attacked her, but he hadn't. No he had just been any normal annoying teen boy like at high school. Oh hell, she would have school with that pain.

"Dawn?"

Buffy had come out of the Magic Shop and had spotted the girl red- handed. Sternly the slayer glared at her little sister.

"Go home now"

"But – " Dawn started to protest.

"No buts" Buffy snapped and pointed her finger in the direction of home. "Now. You don't know what could be out there waiting for you. If I find out from mom that you weren't home in the next five minutes, I wont take you anywhere with me ever again"

Dawn tried to protest again, but was cut off again. There was no use. Grumpy turning around and muttering under her breath about Buffy being a dictator in her spare time, Dawn headed for home.

Buffy on the other hand turned to go find some vampires to stake. Not only had she just learned that her little sister wasn't really her little sister, but a mystical key that needed her protection. What a fabrication of reality, still she wasn't entirely sure wither or not Dawn should know that she wasn't real. Five blocks down she heard yells and knew that there were some vampires about.

On the edge of Pine dr., she found a boy about fifteen or sixteen taking on some vampires. He managed to stake one of them and then was suddenly thrown to the ground with extreme force. This was her element.

"What's that all about guys?" she asked smiling as she went in.

"Damn, it's the slayer!" one snapped and vamped out.

The others followed suit and the boy was left forgotten behind them. They flew in for the kill, but were killed instead by the fierce force of her stake. When she had finished them off in less then record time, she turned to the fallen boy.

"Now could you explain to me why you were stupid enough to do that?"

"My lady in bloodstained armor" he mocked sarcastically. "Oh woe is me"

"Why you little"

Buffy single handedly heaved the teen off the ground and stared into his face.

"Ouch, not so rough. I bruise easily"

His eyes flashed yellow and then stayed on that well-known color. Buffy threw him down, knowing suddenly that she had just saved a vampire. When he staggered up, she pinned him to a tree and held her stake to his heart.

"What are you doing!" he gasped. "If you think I'm a vampire you wrong. I have a logical explanation!"

"Sure, that'll go over well in Hell"

But before Buffy could use her stake on the boy, she was thrown into the air and landed heavily on the ground ten feet away. There was a curse of pain and when she looked up she saw Spike standing in front of the boy. He held his head as he glared down at her.

"I would touch that boy again if I were you slayer, because mark my words if you do, I don't care if chip makes my head explode, but I'll kill you"

She was flabbergasted. What in the world was Spike up to now?

"So James, what brings you to the 'Dale?" he addressed the boy.

"I can't keep the bloody government off my back!" he shouted. "Those damned Social Services workers caught me and said they would send me to a foster home. I told them I had family, you, so that I could come here. Doesn't matter that I'm an immortal human because of you, I'll never make it in this bloody system without you!"

"An immortal human?" Buffy asked dimly.

The two men turned back to Buffy and she suddenly noticed a startling resemblance.

"Its called 'Religieux Jointif' or rather in English 'Spiritually Joined'. Slayer, I'd like you to meet my younger brother James Felix Castles"
Well how was that? I think I might have something here, and if you think I do too, then please review. Later!